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From Microsoft Corporation
Technical Bulletin MC254418 · Published May 5, 2021
Last year we introduced the Reply-all Storm Protection feature to help protect your organization from unwanted reply-all storms. This update, coming soon, allows admins to customize various settings for it.
This message is associated with Microsoft 365 Roadmap ID 68840
When this will happen:
Roll-out for all Microsoft 365 environments will begin in early May and should be completed by early June.
How this will affect your organization:
This update gives Microsoft 365 tenant admins the ability to customize most all of the Reply-all Storm Protection settings to the following parameters:
|Enabled/disabled||Enabled or Disabled|
|Minimum number of recipients||1000 to 5000|
|Minimum number of reply-alls||5 to 20|
|Detection time (sliding window)||60 minutes (not customizable)|
|Block duration||1 to 12 hours|
While most of the default settings remain the same, some have changed:
|Setting||Previous Default||New Default|
|Minimum number of recipients||5000||2500|
|Minimum number of reply-alls||10||10|
|Detection time (sliding window)||60 minutes||60 minutes (not customizable)|
|Block duration||4 hours||6 hours|
What you need to do to prepare:
There is nothing you need to do prepare for this update, but be aware that the change to the default minimum number of recipients from 5000 to 2500 may result in more reply-all storms being detected and acted upon than previously.
You can use the Remote Powershell Set-TransportConfig cmdlet to customize the settings:
- Set-TransportConfig -ReplyAllStormProtectionEnabled [$True:$False]
- Set-TransportConfig -ReplyAllStormDetectionMinimumRecipients [1000 – 5000]
- Set-TransportConfig -ReplyAllStormDetectionMinimumReplies [5 – 20]
- Set-TransportConfig -ReplyAllStormBlockDuration [1 – 12]
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